“My concern there is there are certain gaps ... in the data available to us,” Comey said.
“There is risk associated of bringing anybody in from the outside, but specifically from a conflict zone like that,” he added.
“There is no such thing as a no-risk enterprise and there are deficits that we face.”
In particular, the lack of solid on-the-ground intelligence assets in Syria has clouded the U.S.’s ability to crosscheck the backgrounds of every refugee hoping to come to the U.S., Comey and other national security officials told the Senate panel.
“The intelligence that we have of this particular conflict zone is not as rich as we would like it to be,” said Nicholas Rasmussen, the head of the National Counterterrorism Center. “We’ve got a much more streamlined and effective system to make sure that all of our intelligence holdings are brought to bear as these decisions are made, but you can only review against what you have.”